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Patient sharing and population genetic structure of methicillin-resistant Staphylococcus aureus

Weixiong Ke1, Susan S Huang, Lyndsey O Hudson

  • 1Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 21, 2012
PubMed

Insights

Sharing patients between hospitals reduces genetic diversity of methicillin-resistant Staphylococcus aureus (MRSA) strains. Increased patient sharing correlates with more similar MRSA populations, suggesting coordinated hygiene efforts can prevent infections.

Area of Science:

  • Infectious Diseases
  • Epidemiology
  • Genetics

Background:

  • Hospital-acquired infections, particularly methicillin-resistant Staphylococcus aureus (MRSA), are key indicators of hospital hygiene quality.
  • Understanding interhospital transmission of MRSA is crucial but remains poorly defined.

Purpose of the Study:

  • To evaluate the correlation between the proportion of shared patients between hospitals and the genetic similarity of MRSA strains.
  • To investigate factors influencing MRSA population similarity across hospitals.

Main Methods:

  • Multivariate linear regression analysis was employed.
  • Data were collected from 30 hospitals in Orange County, California.
  • Genetic similarity of MRSA strains was compared based on patient sharing proportions.

Main Results:

  • A twofold increase in shared patients between hospitals correlated with a 7.7% reduction in genetic heterogeneity of MRSA populations (P=0.0356).
  • Hospitals serving only adults exhibited more similar MRSA populations compared to those including pediatric patients.

Conclusions:

  • Patient sharing significantly influences MRSA genetic similarity between hospitals.
  • Collaborative infection control strategies among high-patient-sharing hospitals may enhance MRSA transmission prevention.

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